The song is performed by ex-Kegawa no Maries’ vocalist Ryohei Shima’s one-person project The Dresscodes, but the clip consists of only 3DCG footage from the film.
The theme song CD will be available on October 12, two days before the theatrical release of the film in Japan.
According to Shima’s comment on Twitter, the chosen footage are perfectly matched with the lyrics of the song.